Welded container and cap



March 10, 1953 w. H. FREYGANG 2,630,936

WELDEID CONTAINER AND CAP Filed June so, 1949 2 SHEETS-SHEET 1 ATTORNEYW. H. FREYGANG 2). W QM w y 4 m w MH W. 2 2 w 2 m 2 1 1 @W March 10,1953 Filed June 30, 1949 Patented Mar. 10, 1953 WELDED CONTAINER AND CAPWalter H. Freygang, Essex Fells, N. J., assignor to Kidde Manufacturing00., Inc., Bloomfield, N. 1., a corporation of Delaware Application June30, 1949, Serial No. 102,206

2 Claims.

The present invention relates to cartridges or capsules for storingfluid medium under pressure, and, more particularly, relates to a weldedcontainer and cap structure for confining compressed and/or liquefiedgases such as carbon dioxide, nitrous oxide and the like, and to amethod of forming the weld.

The present invention aims to provide a container having a tubularportion formed with an opening and an annular edge, and a cap having adepending skirt extending into the container opening to position the capon the container for filling of the latter and having an annular flangecontacting the container edge and adapted to be butt welded thereto, theflange being provided with means for admitting fluid medium into thecontainer while the cap is positioned thereon prior to being welded tothe container.

Accordingly, an object of the present invention is to provide acontainer and cap structure which is simple in construction and can beeconomically manufactured.

Another object is to provide a container and cap structure which can bereadily filled while positioned between welding electrodes.

Another object is to provide a container and cap structure adapted forsecurement by resistance welding.

A further object consists in the details of construction and arrangementof the container and cap whereby the foregoing objects are accomplished.

A still further object is to provide an improved method of welding thecap on the container.

Other and further objects of the invention will be obvious upon anunderstanding of the illustrative embodiment about to be described, orwill be indicated in the appended claims, and various advantages notreferred to herein will occur to one skilled in the art upon employmentof the invention in practice.

A preferred embodiment of the invention has been chosen for purposes ofillustration and description, and is shown in the accompanying drawing,forming a part of the specification, wherein:

Figure 1 is an enlarged fragmentary view, partly in section and partlyin elevation, illustrating a container and cap structure in accordancewith the invention prior to securement of the cap to the container.

Figure 2 is a view similar to Figure 1, illustrating the cap andcontainer positioned between welding electrodes and secured to eachother.

Figure 3 is a plan view of the cap as viewed from the underside thereof.

Figure 4 is an end view of the cap as viewed along the line 4- 3 onFigure 3, illustrating a detail of the cap.

Figure 5 is a fragmentary sectional view, illustrating the peripheraledge portion of the container after reforming thereof.

Referring to the drawing in detail, there is shown a cartridge orcapsule comprising a container m and a cap or closure H, eachconstructed of material suitable for welding, such as metal.

The container illustrated herein by way of example is of the bulb-shapedtype having a tubular neck portion 12 formed with an opening l4 andprovided with a bevelled or chamfered annular edge [5. The edge I5preferably is chamfered downwardly and outwardly at an angle of betweenabout ten and twenty degrees to the horizontal to facilitate buttwelding the cap thereto by a resistance welding operation as describedmore fully hereinafter.

The cap ll comprises a central disc portion l6 having a coined area I!on the underside thereof to facilitate piercing, a tubular skirt l9depending from the central portion adapted to extend into the opening Mto cooperate with the inner wall of the tubular neck portion of thecontainer to position the cap on the container during the filling of thelatter, and an annular horizontal flange 20 extending outwardly from theskirt adapted to partially overlie and be superimposed on the containeredge l5 for butt welding thereto.

In order to facilitate filling of the container with fluid medium underpressure while the cap is positioned thereon as illustrated in Figure 1,the underside of the flange is formed with recess means 2| forming apassage for admitting the fluid medium between the flange and thecontainer edge I5. 7

As shown more particularly in Figures 3 and 4, the recess means 2|preferably comprise a pair of diametrically opposed recesses, eachextending along the underside of the flange for approxi matelyone-quarter of the circumference of the flange. These recesses may beadvantageously provided by simultaneously forming the same with thecoined area I! or by separate operations.

In order to fill the cartridge and thereafter weld the container andcap, the cap is placed on the container, as shown in Figure 1, thedepending skirt cooperating with the neck wall to retain the cap inassembled position and thereby facilitate handling thereof eithermanually or by automatic machinery. The assembled cap and container arethen positoned in a charging chamber (not shown) between electrodes 22and 24, such as shown in Figure 2, and fluid medium is admitted to thecharging chamber and is caused to flow into the container by way of thepassages between the cap flange and the container edge.

When a predetermined quantity of fluid medium has been introduced intothe container, electric current is caused to flow between the electrodes22 and 24, which is of a value to produce a resistance weldingoperation. During the flow of the current, axial pressure is applied onthe cap to hold the same on the container, whereby the chamfered edgefuses progressively from its inner periphery towards its outer peripheryand the cap flange thins out to increase its contact area on the edge toform an annular butt weld 25 of considerable width between the container and the cap flange, as shown in Figure 2, serving to confine thefluid medium in the container for storage.

After the container and cap are welded, the peripheral corner of theedge may be crimped to round off the same at 26, as shown in Figure 5.

In view of the foregoing description, it will be seen that the presentinvention provides an improved cartridge for storing fluid medium underpressure which is extremely simple in construction, can be manufacturedeconomically, and is readily filled and closed. The depending skirt iinserted into the neck opening facilitates assembly of the cap andcontainer, and the charnfered edge and the cap flange cooperate toprovide a leak-proof seal for confining liquefied and/or compressed gas.Also, by rounding the peripheral parting from the spirit and scope ofthe invention and without sacrificing any of its advantages, it is to beunderstood that all matter herein is to be interpreted as illustrativeand not in any limiting sense.

I claim:

1. In a welded container and cap structure for confining fluid mediumunder pressure, a container of resistance weldable metal having atubular neck portion formed with an opening and provided at the extremeend thereof with an upwardly facing outwardly and downwardly chamferedannular surface forming a relatively sharp edge defining said opening;and a closure cap of resistance weldable metal having an invertedcup-shaped portion including a central circular section of a thicknessto facilitate puncturing the same and including a tubular dependingskirt extending into said container opening in close proximity to butspaced fromthe inner wall of said tubular neck portion for centeringsaid cap on said container but providing. a passage for the fluid mediumwith which said container is to be filled, and said cap having anannular horizontal flange extending outwardly from said skirt and atleast partially overlying said neck surface with said sharp edgeengaging the underside of said flange adjacent the outer wall of saidskirt, said flange having arcuate circumferentially extending shallowrecess means extending from the outer edge to the inner edge of saidflange at the underside thereof, said recess means having acircumferential length equal to about half the circumference of theflange for permitting fluid medium to pass freely with minimum flowresistance between said flange and said annular container neck surfaceand enter said container while said cap is positioned on said containerprior to being welded thereto, said recess means by reason of theshallowness and circumferential length thereof being readily filled withfused metal of said container edge upon welding said cap to saidcontainer whereby a continuous annular seal is formed between said capflange and said container edge.

2. In a welded container and cap structure for confining fluid mediumunder pressure, a container of resistance weldable metal having atubular neck portion formed with an opening and provided at the extremeend thereof with an upwardly facing outwardly and downwardly chamferedannular surface forming a relatively sharp edge defining said opening;and a closure cap of resistance weldable metal having an invertedcup-shaped portion including a central circular section formed with acentral recess at the underside thereof and including a tubulardepending kirt extending into said container opening in close proximityto but spaced from the inner wall of said tubular neck portion forcentering said cap on said container but providing a passage for thefluid medium with which said container is to be filled, and said caphaving an annular horizontal flange extending outwardly from said skirtand being of a width substantially less than that of said annular necksurface and partially overlying said neck surface with said sharp edgeengaging the underside of said flange adjacent the outer wall of saidskirt, said flange having a pair of arcuate circumferentially extendingand diametrically opposite shallow recesses extending from the outeredge to the inner edge of said flange at the underside thereof, saidrecesses having a, combined circumferential length equal to about halfthe circumference of the flange for permitting fluid medium to passfreely with minimum flow resistance between said flange and said annularcontainer neck surface and enter said container while said cap ispositioned on said container prior to being welded thereto, saidrecesses by reason of their shallowness and circumferential length beingreadily filled with fused metal of said container edge upon welding saidcap to said container whereby va continuous annular seal is formedbetween said cap flange nd said container edge.

WALTER. I-I. FREYGANG.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,380,310 Wolcott May 31, 19211,732,227 Fenn Oct. 22, 1929 2,268,297 O'Neil Dec. 30, 1941 2,280,088Honegger Apr. 21, 1942 2,322,236 Ingram June 22, 1943 2,352,754 AndersonJuly 4, 1944 2,424,801 Crabbe et a1 July 29, 1947 2,425,448 Weida Aug.12, 1947 2,496,883 McKalip Feb. '7, 1950 2,501,621 Smith Mar. 21, 1950

